As I posted elsewhere, I got my Fire in a straight swap: My older Nook Color for a friend's just-purchased Kindle Fire. And I'm loving it. When I got it, my friend had already rooted it. I played around with it and then decided to restore to factory settings....and have no desire to root it again. Here are my reasons to not root my Kindle Fire:
1) When I keep my Fire on the "Apps" page (rather than the carousel page), this looks snazzier than the best home screen / launcher that Android has to offer. I have no need or want of any other starting page.
2) It was annoying having to take that extra step, from the Android launcher, to get to the default Fire screen.
3) The Android Market is not such a big draw....since I now have access, not just to the Amazing Appstore, but also easy access to the GetJar, iMobile, and Slide app stores. There are very, very few apps that I want that I can't get that way (and about the same number that even the Android Market would not let me have when I had my Nook Color rooted). For instance, I'm not rooted, yet have the Nook for Android app.....thanks to the GetJar app store.
4) Really don't want to deal with the headaches that might come every time Amazon issues an update. ("Will it break root or won't it?")
Bottom line: Amazon did a great job of giving me a device that I love, even without rooting it....unlike the Nook Color, which was far more limited without root access.